/*
 *   CrissCross
 *   A multi-purpose cross-platform library.
 *
 *   A product of Uplink Laboratories.
 *
 *   (c) 2006-2008 Steven Noonan.
 *   Licensed under the New BSD License.
 *
 */

#include <crisscross/universal_include.h>

#ifdef ENABLE_HASHES

#include <crisscross/core_io_reader.h>
#include <crisscross/sha512.h>

#define SHFR(x, n)    (x >> n)
#define ROTR(x, n)   ((x >> n) | (x << ((sizeof(x) << 3) - n)))
#define ROTL(x, n)   ((x << n) | (x >> ((sizeof(x) << 3) - n)))
#define CH(x, y, z)  ((x & y) ^ (~x & z))
#define MAJ(x, y, z) ((x & y) ^ (x & z) ^ (y & z))

#define PACK32(str, x)                        \
	{                                             \
		*(x) = ((cc_uint32_t)*((str) + 3))    \
		       | ((cc_uint32_t)*((str) + 2) << 8)    \
		       | ((cc_uint32_t)*((str) + 1) << 16)    \
		       | ((cc_uint32_t)*((str) + 0) << 24);   \
	}

#define UNPACK32(x, str)                      \
	{                                             \
		*((str) + 3) = (cc_uint8_t)((x));       \
		*((str) + 2) = (cc_uint8_t)((x) >> 8);       \
		*((str) + 1) = (cc_uint8_t)((x) >> 16);       \
		*((str) + 0) = (cc_uint8_t)((x) >> 24);       \
	}

#define PACK64(str, x)                        \
	{                                             \
		*(x) = ((cc_uint64_t)*((str) + 7))    \
		       | ((cc_uint64_t)*((str) + 6) << 8)    \
		       | ((cc_uint64_t)*((str) + 5) << 16)    \
		       | ((cc_uint64_t)*((str) + 4) << 24)    \
		       | ((cc_uint64_t)*((str) + 3) << 32)    \
		       | ((cc_uint64_t)*((str) + 2) << 40)    \
		       | ((cc_uint64_t)*((str) + 1) << 48)    \
		       | ((cc_uint64_t)*((str) + 0) << 56);   \
	}

#define UNPACK64(x, str)                      \
	{                                             \
		*((str) + 7) = (cc_uint8_t)((x));       \
		*((str) + 6) = (cc_uint8_t)((x) >> 8);       \
		*((str) + 5) = (cc_uint8_t)((x) >> 16);       \
		*((str) + 4) = (cc_uint8_t)((x) >> 24);       \
		*((str) + 3) = (cc_uint8_t)((x) >> 32);       \
		*((str) + 2) = (cc_uint8_t)((x) >> 40);       \
		*((str) + 1) = (cc_uint8_t)((x) >> 48);       \
		*((str) + 0) = (cc_uint8_t)((x) >> 56);       \
	}

#define SHA512_F1(x) (ROTR(x, 28) ^ ROTR(x, 34) ^ ROTR(x, 39))
#define SHA512_F2(x) (ROTR(x, 14) ^ ROTR(x, 18) ^ ROTR(x, 41))
#define SHA512_F3(x) (ROTR(x, 1) ^ ROTR(x, 8) ^ SHFR(x, 7))
#define SHA512_F4(x) (ROTR(x, 19) ^ ROTR(x, 61) ^ SHFR(x, 6))

#define SHA512_SCR(i)                         \
	{                                             \
		w[i] = SHA512_F4(w[i - 2]) + w[i - 7]  \
		       + SHA512_F3(w[i - 15]) + w[i - 16]; \
	}

#define SHA512_EXP(a, b, c, d, e, f, g, h, j)               \
	{                                                           \
		t1 = wv[h] + SHA512_F2(wv[e]) + CH(wv[e], wv[f], wv[g]) \
		     + sha512_k[j] + w[j];                              \
		t2 = SHA512_F1(wv[a]) + MAJ(wv[a], wv[b], wv[c]);       \
		wv[d] += t1;                                            \
		wv[h] = t1 + t2;                                        \
	}

static cc_uint64_t sha512_h0[8] =
{0x6a09e667f3bcc908ULL, 0xbb67ae8584caa73bULL,
 0x3c6ef372fe94f82bULL, 0xa54ff53a5f1d36f1ULL,
 0x510e527fade682d1ULL, 0x9b05688c2b3e6c1fULL,
 0x1f83d9abfb41bd6bULL, 0x5be0cd19137e2179ULL};

static cc_uint64_t sha512_k[80] =
{0x428a2f98d728ae22ULL, 0x7137449123ef65cdULL,
 0xb5c0fbcfec4d3b2fULL, 0xe9b5dba58189dbbcULL,
 0x3956c25bf348b538ULL, 0x59f111f1b605d019ULL,
 0x923f82a4af194f9bULL, 0xab1c5ed5da6d8118ULL,
 0xd807aa98a3030242ULL, 0x12835b0145706fbeULL,
 0x243185be4ee4b28cULL, 0x550c7dc3d5ffb4e2ULL,
 0x72be5d74f27b896fULL, 0x80deb1fe3b1696b1ULL,
 0x9bdc06a725c71235ULL, 0xc19bf174cf692694ULL,
 0xe49b69c19ef14ad2ULL, 0xefbe4786384f25e3ULL,
 0x0fc19dc68b8cd5b5ULL, 0x240ca1cc77ac9c65ULL,
 0x2de92c6f592b0275ULL, 0x4a7484aa6ea6e483ULL,
 0x5cb0a9dcbd41fbd4ULL, 0x76f988da831153b5ULL,
 0x983e5152ee66dfabULL, 0xa831c66d2db43210ULL,
 0xb00327c898fb213fULL, 0xbf597fc7beef0ee4ULL,
 0xc6e00bf33da88fc2ULL, 0xd5a79147930aa725ULL,
 0x06ca6351e003826fULL, 0x142929670a0e6e70ULL,
 0x27b70a8546d22ffcULL, 0x2e1b21385c26c926ULL,
 0x4d2c6dfc5ac42aedULL, 0x53380d139d95b3dfULL,
 0x650a73548baf63deULL, 0x766a0abb3c77b2a8ULL,
 0x81c2c92e47edaee6ULL, 0x92722c851482353bULL,
 0xa2bfe8a14cf10364ULL, 0xa81a664bbc423001ULL,
 0xc24b8b70d0f89791ULL, 0xc76c51a30654be30ULL,
 0xd192e819d6ef5218ULL, 0xd69906245565a910ULL,
 0xf40e35855771202aULL, 0x106aa07032bbd1b8ULL,
 0x19a4c116b8d2d0c8ULL, 0x1e376c085141ab53ULL,
 0x2748774cdf8eeb99ULL, 0x34b0bcb5e19b48a8ULL,
 0x391c0cb3c5c95a63ULL, 0x4ed8aa4ae3418acbULL,
 0x5b9cca4f7763e373ULL, 0x682e6ff3d6b2b8a3ULL,
 0x748f82ee5defb2fcULL, 0x78a5636f43172f60ULL,
 0x84c87814a1f0ab72ULL, 0x8cc702081a6439ecULL,
 0x90befffa23631e28ULL, 0xa4506cebde82bde9ULL,
 0xbef9a3f7b2c67915ULL, 0xc67178f2e372532bULL,
 0xca273eceea26619cULL, 0xd186b8c721c0c207ULL,
 0xeada7dd6cde0eb1eULL, 0xf57d4f7fee6ed178ULL,
 0x06f067aa72176fbaULL, 0x0a637dc5a2c898a6ULL,
 0x113f9804bef90daeULL, 0x1b710b35131c471bULL,
 0x28db77f523047d84ULL, 0x32caab7b40c72493ULL,
 0x3c9ebe0a15c9bebcULL, 0x431d67c49c100d4cULL,
 0x4cc5d4becb3e42b6ULL, 0x597f299cfc657e2aULL,
 0x5fcb6fab3ad6faecULL, 0x6c44198c4a475817ULL};

static void sha512_transf(cc_sha512_ctx *ctx, const unsigned char *message, unsigned int block_nb)
{
	cc_uint64_t          w[80];
	cc_uint64_t          wv[8];
	cc_uint64_t          t1, t2;
	const unsigned char *sub_block;
	int                  i, j;

	for (i = 0; i < (int)block_nb; i++) {
		sub_block = message + (i << 7);

#ifndef UNROLL_LOOPS
		for (j = 0; j < 16; j++) {
			PACK64(&sub_block[j << 3], &w[j]);
		}

		for (j = 16; j < 80; j++) {
			SHA512_SCR(j);
		}

		for (j = 0; j < 8; j++)	{
			wv[j] = ctx->h[j];
		}

		for (j = 0; j < 80; j++) {
			t1 = wv[7] + SHA512_F2(wv[4]) + CH(wv[4], wv[5], wv[6])
			     + sha512_k[j] + w[j];
			t2 = SHA512_F1(wv[0]) + MAJ(wv[0], wv[1], wv[2]);
			wv[7] = wv[6];
			wv[6] = wv[5];
			wv[5] = wv[4];
			wv[4] = wv[3] + t1;
			wv[3] = wv[2];
			wv[2] = wv[1];
			wv[1] = wv[0];
			wv[0] = t1 + t2;
		}

		for (j = 0; j < 8; j++)	{
			ctx->h[j] += wv[j];
		}

#else
		PACK64(&sub_block[  0], &w[ 0]); PACK64(&sub_block[  8], &w[ 1]);
		PACK64(&sub_block[ 16], &w[ 2]); PACK64(&sub_block[ 24], &w[ 3]);
		PACK64(&sub_block[ 32], &w[ 4]); PACK64(&sub_block[ 40], &w[ 5]);
		PACK64(&sub_block[ 48], &w[ 6]); PACK64(&sub_block[ 56], &w[ 7]);
		PACK64(&sub_block[ 64], &w[ 8]); PACK64(&sub_block[ 72], &w[ 9]);
		PACK64(&sub_block[ 80], &w[10]); PACK64(&sub_block[ 88], &w[11]);
		PACK64(&sub_block[ 96], &w[12]); PACK64(&sub_block[104], &w[13]);
		PACK64(&sub_block[112], &w[14]); PACK64(&sub_block[120], &w[15]);

		SHA512_SCR(16); SHA512_SCR(17); SHA512_SCR(18); SHA512_SCR(19);
		SHA512_SCR(20); SHA512_SCR(21); SHA512_SCR(22); SHA512_SCR(23);
		SHA512_SCR(24); SHA512_SCR(25); SHA512_SCR(26); SHA512_SCR(27);
		SHA512_SCR(28); SHA512_SCR(29); SHA512_SCR(30); SHA512_SCR(31);
		SHA512_SCR(32); SHA512_SCR(33); SHA512_SCR(34); SHA512_SCR(35);
		SHA512_SCR(36); SHA512_SCR(37); SHA512_SCR(38); SHA512_SCR(39);
		SHA512_SCR(40); SHA512_SCR(41); SHA512_SCR(42); SHA512_SCR(43);
		SHA512_SCR(44); SHA512_SCR(45); SHA512_SCR(46); SHA512_SCR(47);
		SHA512_SCR(48); SHA512_SCR(49); SHA512_SCR(50); SHA512_SCR(51);
		SHA512_SCR(52); SHA512_SCR(53); SHA512_SCR(54); SHA512_SCR(55);
		SHA512_SCR(56); SHA512_SCR(57); SHA512_SCR(58); SHA512_SCR(59);
		SHA512_SCR(60); SHA512_SCR(61); SHA512_SCR(62); SHA512_SCR(63);
		SHA512_SCR(64); SHA512_SCR(65); SHA512_SCR(66); SHA512_SCR(67);
		SHA512_SCR(68); SHA512_SCR(69); SHA512_SCR(70); SHA512_SCR(71);
		SHA512_SCR(72); SHA512_SCR(73); SHA512_SCR(74); SHA512_SCR(75);
		SHA512_SCR(76); SHA512_SCR(77); SHA512_SCR(78); SHA512_SCR(79);

		wv[0] = ctx->h[0]; wv[1] = ctx->h[1];
		wv[2] = ctx->h[2]; wv[3] = ctx->h[3];
		wv[4] = ctx->h[4]; wv[5] = ctx->h[5];
		wv[6] = ctx->h[6]; wv[7] = ctx->h[7];

		j = 0;

		do {
			SHA512_EXP(0, 1, 2, 3, 4, 5, 6, 7, j); j++;
			SHA512_EXP(7, 0, 1, 2, 3, 4, 5, 6, j); j++;
			SHA512_EXP(6, 7, 0, 1, 2, 3, 4, 5, j); j++;
			SHA512_EXP(5, 6, 7, 0, 1, 2, 3, 4, j); j++;
			SHA512_EXP(4, 5, 6, 7, 0, 1, 2, 3, j); j++;
			SHA512_EXP(3, 4, 5, 6, 7, 0, 1, 2, j); j++;
			SHA512_EXP(2, 3, 4, 5, 6, 7, 0, 1, j); j++;
			SHA512_EXP(1, 2, 3, 4, 5, 6, 7, 0, j); j++;
		} while (j < 80);

		ctx->h[0] += wv[0]; ctx->h[1] += wv[1];
		ctx->h[2] += wv[2]; ctx->h[3] += wv[3];
		ctx->h[4] += wv[4]; ctx->h[5] += wv[5];
		ctx->h[6] += wv[6]; ctx->h[7] += wv[7];
#endif   /* !UNROLL_LOOPS */
	}
}

static void sha512_init(cc_sha512_ctx *ctx)
{
#ifndef UNROLL_LOOPS
	int i;
	for (i = 0; i < 8; i++) {
		ctx->h[i] = sha512_h0[i];
	}

#else
	ctx->h[0] = sha512_h0[0]; ctx->h[1] = sha512_h0[1];
	ctx->h[2] = sha512_h0[2]; ctx->h[3] = sha512_h0[3];
	ctx->h[4] = sha512_h0[4]; ctx->h[5] = sha512_h0[5];
	ctx->h[6] = sha512_h0[6]; ctx->h[7] = sha512_h0[7];
#endif   /* !UNROLL_LOOPS */

	ctx->len = 0;
	ctx->tot_len = 0;
}

static void sha512_update(cc_sha512_ctx *ctx, const unsigned char *message, unsigned int len)
{
	unsigned int         block_nb;
	unsigned int         new_len, rem_len, tmp_len;
	const unsigned char *shifted_message;

	tmp_len = SHA512_BLOCK_SIZE - ctx->len;
	rem_len = len < tmp_len ? len : tmp_len;

	memcpy(&ctx->block[ctx->len], message, rem_len);

	if (ctx->len + len < SHA512_BLOCK_SIZE) {
		ctx->len += len;
		return;
	}

	new_len = len - rem_len;
	block_nb = new_len / SHA512_BLOCK_SIZE;

	shifted_message = message + rem_len;

	sha512_transf(ctx, ctx->block, 1);
	sha512_transf(ctx, shifted_message, block_nb);

	rem_len = new_len % SHA512_BLOCK_SIZE;

	memcpy(ctx->block, &shifted_message[block_nb << 7],
	       rem_len);

	ctx->len = rem_len;
	ctx->tot_len += (block_nb + 1) << 7;
}

static void sha512_final(cc_sha512_ctx *ctx, unsigned char *digest)
{
	unsigned int block_nb;
	unsigned int pm_len;
	unsigned int len_b;

#ifndef UNROLL_LOOPS
	int          i;
#endif

	block_nb = 1 + ((SHA512_BLOCK_SIZE - 17)
	                < (ctx->len % SHA512_BLOCK_SIZE));

	len_b = (ctx->tot_len + ctx->len) << 3;
	pm_len = block_nb << 7;

	memset(ctx->block + ctx->len, 0, pm_len - ctx->len);
	ctx->block[ctx->len] = 0x80;
	UNPACK32(len_b, ctx->block + pm_len - 4);

	sha512_transf(ctx, ctx->block, block_nb);

#ifndef UNROLL_LOOPS
	for (i = 0 ; i < 8; i++) {
		UNPACK64(ctx->h[i], &digest[i << 3]);
	}

#else
	UNPACK64(ctx->h[0], &digest[ 0]);
	UNPACK64(ctx->h[1], &digest[ 8]);
	UNPACK64(ctx->h[2], &digest[16]);
	UNPACK64(ctx->h[3], &digest[24]);
	UNPACK64(ctx->h[4], &digest[32]);
	UNPACK64(ctx->h[5], &digest[40]);
	UNPACK64(ctx->h[6], &digest[48]);
	UNPACK64(ctx->h[7], &digest[56]);
#endif   /* !UNROLL_LOOPS */
}


namespace CrissCross
{
	namespace Crypto
	{
		SHA512Hash::SHA512Hash() : m_hashString(NULL), m_hash(NULL)
		{
			Reset();
		}

		SHA512Hash::~SHA512Hash()
		{
			Reset();
		}

		int SHA512Hash::Process(const void * _data, size_t _length)
		{
			Reset();
			if (!_length || !_data) return -1;

			sha512_update(&m_state, (const unsigned char *)_data, _length);
			m_hash = new unsigned char[SHA512_DIGEST_SIZE];
			sha512_final(&m_state, m_hash);
			return 0;
		}

		int SHA512Hash::Process(CrissCross::IO::CoreIOReader *_reader)
		{
			Reset();
			if (!_reader) return -1;

			cc_int64_t pos = _reader->Position();
			_reader->Seek(0);
			char       buffer[8192]; int bytesRead = 0;
			do
			{
				bytesRead = _reader->Read(buffer, sizeof(buffer), 0, sizeof(buffer));
				if (bytesRead >= 0)
					ProcessBlock(buffer, bytesRead);
			} while (bytesRead == sizeof(buffer) && !_reader->EndOfFile());
			Finalize();
			_reader->Seek(pos);
			return 0;
		}

		int SHA512Hash::ProcessBlock(const void * _data, size_t _length)
		{
			if (!_data) return -1;

			sha512_update(&m_state, (unsigned char *)_data, _length);
			return 0;
		}

		void SHA512Hash::Finalize()
		{
			if (m_hash) delete [] m_hash;

			m_hash = new unsigned char[SHA512_DIGEST_SIZE];
			sha512_final(&m_state, m_hash);
		}

		const char *SHA512Hash::ToString() const
		{
			if (m_hashString) return m_hashString;

			m_hashString = new char[SHA512_DIGEST_SIZE * 2 + 1];
			for (int i = 0; i < SHA512_DIGEST_SIZE; i++)
				sprintf(m_hashString + (i * 2), "%02x", m_hash[i]);

			return m_hashString;
		}

		void SHA512Hash::Reset()
		{
			delete [] m_hash; m_hash = NULL;
			delete [] m_hashString; m_hashString = NULL;

			sha512_init(&m_state);
		}

		bool SHA512Hash::operator==(const SHA512Hash &_other) const
		{
			return (memcmp(m_hash, _other.m_hash, SHA512_DIGEST_SIZE) == 0);
		}
	}
}

#endif
